Originally Posted by
Bongo
1. If Fling gets countered, you're toast. If Shrap gets countered, you can quickly reload since you haven't used all your resources.
2. Fling is mainly good against Aggro or Combo without counters, while Shrap is better when you have to take Counterspells into account. Most aggro matchups are in your favor anyway, while decks packing counterspells are more difficult to win. Hence, you use Shrapnel Blast to make your iffy matchups a little better.
3. Fling is mostly good on the attack, while Shrap can be used proactively and reactively.
4. Fling is shit without Ravager/Atog, Shrapnel Blast is not. You pack 8 Ravager/Atog at most, while 40-50 artifacts are there for Shrapnel Blast.